Stair construction



NOV. 22, 1932. J ODONNELL 1,888,686

S TAIR CONSTRUCTION Filed Sept. 20, 1950' 2 Sheets-Sheet 1 v INVENTOR. 70218. 0D07Z7Z6ZZ,

ORNEY.

Nov. .22, 1932.

J. R. ODONNELL STAIR CONSTRUCTION Filed Sept. 20, 1930 2 Sheets-Sheet 2 IJYVENTOR. 0007273625, 1

Patented Nov. 22, 1932 UNITED STATES JOHN nonnar ononnnnn, onianooxrrn, new YORK STAIR oons'rnuorron Application filed' September 20, 1930. Serial No; 483,172.

The invention relates to stair construction employing .both structural steel and rein-- forced concrete elements as. carrying members, all so combined as to produce a more 7 economical and otherwise more satisfactory fireproof stair than other existing types'o all steel'or composite structures. Y

The general object-of this invention is to refine the type of stair construction disclosed In in my previous Patent No. 1,555,750, dated September 29, 1925, so as to efl'ect a substantial saving in time, labor and expense.

The present invention recognizes the purpose of using steel forms in combination with either bent plate strings or pressed steel strings in constructing concrete stairs of two different types. Onetype is knownin'the trade as Econo stairs having structural steel channel stringers provided =with inwardly projecting top and bottom flanges to support the reinforced concrete structure. In this type of stairs the steel forms are used for moulding the concrete, which flows into the channel stringers and forms the steps, risers and soflits'. i The other type of stairs is known in the trade as OQD. Type B stairs having bent plate strings provided with outwardly pro jecting top flanges and inwardly projecting 3 bottom flanges to support the reinforced concrete structure In this type of stairs only the step and riser portions are formed of concrete and the riser portions of the steel forms are often left permanently embedded in the concrete to provide a steel facing for the concrete risers.

The invention thus involves a combined structural steel and reinforced poured-in place stair construction, in which the steel 40 members, besides entering into the permanent structure, act as part of the form-work for supporting members carrying adjustable side forms, extensible riser-forms and floor forms preferably constructed substantially as hereinafter described. In the accompanying drawings forming part hereof:

Figure 1 is a vertical horizontal sectional view through a portion of the form-work. Figure 2 is a topplan view thereof.

Figures is ,a detail perspective view of a portiongof.v a bent plate stringersupporting V a portion of the form-work. I t

Figure 4 is across sectional view through a portion of astairs showing a pressed steel stringer supporting a portion of the form work. a I Figures5, 6 and 7 are vertical longitudinal sectional views through portions, of com pleted' stairs showing different types of'stair's constructed in accordance with the invention.

In my previous patent, the side forms and connected risers were secured to the; inner sides of the top flanges of' the strings after the strings were set in position; This .procedure was found tediousand undesirable as it required considerable work in setting and accuratelyadjusting the side forms, before the risers were connected thereto.

I With this invention this objectionable feattureis overcome because all .of;the side forms are secured to and suspended fromljwoode'n strips which overlie andarejsupported on the upper top flanges of the strings. The strips may be laid onthe floorland the side forms 7 conveniently secured thereto in their proper spaced relation, thus providing a complete unit which may be readily liftedand secured inposition on the top of the strin s. f

Referring to the drawings in detail, 1 designates the inclined strings which may be bent steel plate, pressed steelsections, or of a built up section. The bentsteel plates aredisposed with their upper flanges 2 projecting outwardly and their-lower flanges 3'projecting inwardly. Between these strings are supported side forms 4, riser forms 5 and an inclined floor-form 6 is secured beneath the sideand riser-forms. a 9 e "The side forms 4 are secured to-the inner sides of supporting members such as wooden strips 7 whichoverlie and are supported'jon the upper top flanges of the strings 1. When the strips are superimposed;v on the strings they arefsecuredin positionto prevent their f displacement, by any. suitable clamping means not shown. The side formsareirrgfilar in shape and are designed andpositioned so as to lie in theangles between thetrjeads "and risers of the stairstobe constructed. The 7190 side forms are made of sheet iron and as shown are held suspended from the strips 7 by nails 8, passing through perforations in the sheet and entering into the'sides of the strips 7. Each of the forms 4 is provided with a diagonal slot 9, adjacent to its upper edge, through which passes the. threaded end of a bolt 10, secured in thestrip '7. A nut 11 is mounted on the threaded end of the bolt and acts to clamp the side form to the inner side.

of the strip. Through this slotted connection a variable longitudinal adjustment .of the form is permitted. After the side forms have been adjusted and secured in'theirxproper spaced'relation to each other the nails 8 are then driven through the openings in the sheet 4 and into the .st ips7'to-h0ld the forms in their proper set position.

. -E ach of the side forms has welded 'on the inner side of one end apair of angle pieces 12"and' 13to provide a pairof brackets to which the riser-form 5 is connected. Bolts 'lf projecting from the form 5 adjacent its end and passing through horizontal slots 15 formed in the brackets, together with the nuts 16 on the front end of the bolts, provide am'eans for securing the riser-form to theside-form in a horizontal adjustable position; 'Thisadjusting feature permits "variable spacing longitudinally of the riser-forms. The riser-forms are also made of sheet iron and pressed into the shape shown to provide I a horizontal outwardlybulged portion 18,

. neat'and artistic appearance.

which, forms a depression in the face of the risers of thecompleted stairs to give them a The riserforms maybe made in various shapes if desiredand "provided with an outwardly,pro-

frames 20 are supportedoncross-pieces 23,

the-ends of which extend beyond the-sides of the floor form. The said ends are longitudinally slotted, as indicated at 24-, to cooperate with hanger rods 25, which extend downwardly from the'strip 7 through the slots24,

beneath which they are provided with nuts 26.;J;P1ates, forming brackets 27 are connect- .edto the top of the-strips 7 by means 'of nuts reinforcing rods '32 are arranged above the floor and below the riser-forms, see Fig. 4:.

In constructing the Econo type of stairs,

as shown in Fig. 4, it is noted that the side forms 4: are held in spaced relation to the inner sides of the channel steel stringers 1a.

When the concrete is poured itwillithus flow behind the side forms :thus permitting-the cheeks, steps, risers, and sofiits to be completely molded in one operation. In constructingthe OJD. Type B. form of stairs, as shown in Fig. 3, the side forms 4 are held against the inner side faces, of the )bentQplate stringers 1, thus providingthe means for securing: the riser-formsthereto I so'lthat when theconcrete is poured onlylithe steps, soffits and risers are completelymolded 1 in one operation... 7 H As shown inFig. 5 the'riser-form ma -t6 utilized to formpermanent metal. risers '33 and when such is thecase', they have secured to their innerface', channel bars 34,:whi'ch' I are embedded'in the concrete topermanently 1 a secure the risers inposition. As shown in Fig. 6, the stairs may be provided with permanentmetal noses 36. and as shown in Fig. 7, they may be providedwithj safety'treads 37. a. 7 What is claimed'as'newis'-,

1. In concrete stair constructiomthe comr bination' of strings having flanges disposed on their upper edges, saidv stringsconstituting part of the form workzand "eventually entering into the permanent c'onstructiomsup porting strips superimposed upon/the strings,

said strips being longitudinally?arranged with respect to the stringsand being. sub: stantially coextensive therewith, side-forms secured to the stripsand riserrformsextend ing between the 2. In 7 concrete stair construction, 1 combination of strings having inwardlyldisposed flanges on their lower end and outwardly'dis posed flanges on their upperl'end, and even;

tually entering into the permanent construction, supporting strips superimposed upon the upper flanges, adjustable side-forms sefings and-secured tosaid side-forms. I

cured to the inner sides of the strips, and

riser-forms extending between the strings and i secured to said side-forms. I 1 In testimony whereofI haveafiixed my signature.

andbolts 28. These plates project respectively beyond the outer sides-of the strips 7 and are formed with bolt holesadaptedto receive itheiupper ends of the hanger rods .25. By tightening'the nuts 30, the cross-pieces 23. are clamped upward against "the strings or against the section :frames 20. r

When the form-work is} setup the usual JOHN no ER'r ojno NELLL I 

